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BrianG · 01.15.2013, 11:54 PM

An astable oscillator using a 555 timer IC and a few resistors and caps. A little experimentation may be needed to find the right frequency to satisfy the supply.

or, use just one fan and route the rpm signal so that it also goes to the other fan slot.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	01.15.2013, 11:54 PM An astable oscillator using a 555 timer IC and a few resistors and caps. A little experimentation may be needed to find the right frequency to satisfy the supply. or, use just one fan and route the rpm signal so that it also goes to the other fan slot.